On 08/14/2013 01:05 PM, Greg KH wrote: > On Wed, Aug 14, 2013 at 11:43:37AM -0500, Peter Hyman wrote: >> Linux Kernel: 3.9.10 >> Device Driver: usb/serial/sierra.c >> Device Driver version: not known >> >> Apparently Sierra has sold the AirCard 250U product to Netgear, so I am >> sure driver development on drivers/usb/serial/sierra.c will be in limbo >> for a period. While I am copying linux@xxxxxxxxxxxxxxxxxx, they will not >> do anything since they don't own the product anymore. >> >> Nonetheless, I uncovered a problem when using the AC250U Aircard device >> Vendor 0x1199, Product 0x0301. If the device is used in Windows and set >> to 4G mode, using the device in Linux will fail to create the ppp0 >> network interface. I could find no workaround. Even though the device >> can be reached and modem commands sent, ppp0 won't be created. I >> regression tested this all the way back to kernel 3.2.29, and I also >> tried the unpublished sierra driver 1.7.40 which works up to kernel >> 3.4.x iirc. The issue is the same. >> >> The workaround is to set the device to 3G mode and then use in Linux. I >> wrote this FAQ in case it is of interest. > How do you set the device to 3G mode? Can this be done in Linux using > the latest version of modemmanager and networkmanager? > > thanks, > > greg k-h I do not know if there is an AT command for this. Worth investigating though. I have zero documentation on the device and the driver, sierra.c, ignores 4G altogether. -- Peter Hyman C: +1(609)598-0262 http://www.peterhyman.com http://www.linkedin.com/in/peterh -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
